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Solve this following

Question:

If $A=\left[\begin{array}{cc}1 & 0 \\ -1 & 7\end{array}\right]$ and $B=\left[\begin{array}{cc}0 & 4 \\ -1 & 7\end{array}\right]$, find $\left(3 A^{2}-2 B+1\right)$

Solution:

Given : $A=\left[\begin{array}{cc}1 & 0 \\ -1 & 7\end{array}\right]$ and $B=\left[\begin{array}{cc}0 & 4 \\ -1 & 7\end{array}\right]$,

 

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